Plug receptacle



Dec. 13, 1932. F, P, GATES 1,891,153

' PLUG RECEPTACLE Filed Aug- 24' .1928

Patented Dec. 13, 1932 UNITED STATES PATENT OFFICE FREDERIC l. GATES, OF WEST' HARTFORD, CONNECTICUT, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE ARROW-HART & HEGEMAN ELECTRIC COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT PLUG RECEPTACLE Application filed August 24, 1928.

This invention relates to an attachment plug for power devices such as electric ranges, and hereinafter termed a load or loads and more particularly to providing grounding means in the plug for the power device.

An object of the invention, therefore, is to provide an attachment plug having grounding means therein.

Another object of the invention is to provide grounding means for a power device, through the intermediary of a novel type of attachment plug. Y

Other objects will appear hereinafter.

In the drawing in which is illustrated one form of my invention:

Fig. 1 is a perspective view of the cap portion of the attachment plug;

Fig. 2 is a perspective view of the base portion;

Fig. 3 is a vertical section through the assembled device;

Fig. 4 is a view taken on line 4-4 of Fig. 3; a Fig. 5 is a view taken on line 5 5 of Fig. 3, looking in the direction of the arrows;

Fig. 6 is a view taken on line 6 6 of Fig. 3, looking in the direction of the arrows; and

Fig. 7 is a detail section taken on line 7 7 of Fig. 6.

As will be seen, the plug in the present instance is wired for a three wire system, although the invention is susceptible to use in any types of circuits, and is provided in the base with contact clips 1, 2, 3 and 4; clips 1, 35 2 and 3 being contacted to or formed integrally with hollow lugs 5, 6, and 7 by means of which the clips are attached to outlet leads. It will be seen that clip 4 is unattached to any lug, but is directly attached, as is evident 40 from Fig. 3, to the supporting strap 8 which has upturned legs 9, terminating in outwardly extending iianges 10.r These flanges 10 may be provided with holes 11 for the reception of screws, bolts or other form of clamp- 45 ing means. It is obvious thatv the exact shape Serial No. 301,745.

of the supporting strap may be varied at will without departing from the spirit of the invcntion.

As seen in Fig. 3, the base comprises a botto-m section 12 on which the clips are snugly seated in depressions, and a co-operating top member 13, also provided with longitudinal channels 14, 15, 16 and 17, adaptedto receive blades 18, 19, 20 and 2l.

The above-mentioned blades are preferably contained in a two part cap having. a top portion 22 and a bottom portion 23. The top portion 22 may be centrally bored as at 24 to receive the metal-sheathed cable 25, in which are contained the three leading-inwires 26, 27 and 28. These wires are received in lug elements 29, 30 and 3l, formed on the ends of clips 18, 19 and 20.

Around the cap portion of the plug is a retaining strap comprised of metal strips 32 and 33. These straps each conform to the shape of the cap and are preferably diametrically opposed. At their upper ends they terminate in semi-circular yokes 34 and 35 having wings thereon for the reception of securing means, such as screws or bolts 36.

rThe side walls and bottom faceof lower section 23 are preferably cnt away as at 37 and 38 to receive the inturned anges 39 and 40 of the straps` 32 and These straps in their preferred formare provided with slots 41 and 42, which cooperate with recesses 43 and 44 in the top section 22 of the cap, for the reception of screws or bolts 45 and 46. by means of which the two portions 22 and 23, and the straps 32 and 33 are secured together, thescrews 45 and 46 extending through the flanges 39 and 40 of the strap.

The contact blade'21 is integrally formed as a downturned continuation of flange 39.

As will be seen from Fig. 3, the clip 4 is electrically and mechanically attached to the supporting strap 8 by suitable means such as the screw 47.

5 tact with clips 1, 2, 3 and 4, the frame of the power device, having been connected to the supporting strap 9, will be grounded by means of a circuit through 9, and thence through bolt 47, clip 4, blade 21, `flange 39,

l0 strip 32, yoke 34 and cable 25 back to the power source.

In this way an eilicient and 'positive grounding means is easily and sim ly supplied, the only connections required eing to attach the supporting strap of the plug to the power or load device.

Numerous modifications will be apparent to those skilled in the' art, and it is intended that the scope of the invention be limited only by the appended claims.

I claim:

1. A two part connector comprising a plug and a receptacle, a clip carried y said receptacle, means for electrically connecting sald cli to an article to be grounded, a metallic strip extending partly around the exterior .v i of Said plu said strip having a contact blade at one en which removably contacts with said clip, said metallic strip being adapted to begrounded at its other end.

2. two part connector comprising ka plug and a receptacle,a clip carried by said receptacle, means for electrically connecting said clip to an article to be grounded, a plurality of o posed strips arranged around the exterior o said plug and servmg to embracingly hold the parts thereof together, at least one of said strips being metalllc, the metallic strip having a contact blade at one end which removably contacts with said clip, said metallic strip being adapted to be grounded at its other end.

3. A two part connector comprising an4 attachment plug and socket having a strap around one part, said strap being adapted for electrical connection with an article to be ounded, said strap being electrically connected with a clip in said part which it surrounds, a plurality of opposed strips arranged around the exterior of the other part at least one of said strips being metallic,

the metallic strip having a contact blade, which removably contacts with said clip, said metallic strip being adapted to be grounded at its other end.

4. A two part connector comprising an attachment plug and receptacle having a strap around one part thereof adapted for electrical connection with an article to be grounded, four contact clips in said one part, three of'which are connected to Youtlet leads and the fourth of `which is electrically connected to said strap, the other part of the connector having four contact blades, three of which wires contained in a. metallic sheath and removably contacting at the other and with said three clips, the other of said blades removably contacting at the other end to said fourth clip, and a plurality of opposed strips arranged around the exterior of said lastmentioncd part at least one of said stri s being metallic, the single contact blade ing formed on one end of the metallic strip and the other end of the strip bein electrically connected to the metallic sheat thus com- -pleting a ground connection.

- FREDERIC P. GATES.

-5 blades are connected at one end to leading-in i 

